Apparatus

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sensors Mode-S transponder

A1D3D8

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N217DK · ROBINSON R-44 Raven · operated by HAWAII PACIFIC AVIATION INC

Hex
A1D3D8
Octal
50351730
Decimal
10,605,528
Country
US
Tail
N217DK
Type
R44
No current signal · last broadcast 5h ago
Flights observed
132
Distinct callsigns
1
Country
US
Last broadcast
5h ago

Last known position

Most recent position reported by Mode-S A1D3D8.

Country allocation

The ICAO 24-bit address A1D3D8 falls within the block assigned to United States (US) by ICAO Annex 10, Volume III. Every aircraft registered in United States receives a permanent address from this block at the time of registration; the address stays with the airframe even if the aircraft is re-registered to a different operator within the country.

Callsign history 1 distinct

Callsign Airline Flights Last seen
N217DK - 132 2026-07-14

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 N217DK - Jul 14, 05:35 UTCJul 14, 06:25 UTC50m
2026-07-14 N217DK - Jul 14, 04:45 UTCJul 14, 04:55 UTC10m
2026-07-13 N217DK KOA → KOA Jul 13, 17:45 UTCJul 13, 18:30 UTC45m
2026-07-13 N217DK - Jul 13, 05:45 UTCJul 13, 06:05 UTC20m
2026-07-13 N217DK - Jul 13, 04:55 UTCJul 13, 05:05 UTC10m
2026-07-11 N217DK KOA → KOA Jul 11, 19:45 UTCJul 11, 20:30 UTC45m
2026-07-10 N217DK - Jul 10, 22:00 UTCJul 10, 22:10 UTC10m
2026-07-10 N217DK - Jul 10, 19:30 UTCJul 10, 19:50 UTC20m
2026-07-10 N217DK KOA → KOA Jul 10, 04:35 UTCJul 10, 05:00 UTC25m
2026-07-09 N217DK - Jul 9, 20:15 UTCJul 9, 20:25 UTC10m
2026-07-09 N217DK - Jul 9, 17:35 UTCJul 9, 17:50 UTC15m
2026-07-08 N217DK - Jul 8, 21:40 UTCJul 8, 21:55 UTC15m
2026-07-08 N217DK - Jul 8, 19:25 UTCJul 8, 19:35 UTC10m
2026-07-08 N217DK - Jul 8, 17:30 UTCJul 8, 17:45 UTC15m
2026-07-08 N217DK KOA → KOA Jul 8, 00:45 UTCJul 8, 02:00 UTC1h 15m
2026-07-07 N217DK - Jul 7, 19:40 UTCJul 7, 20:40 UTC1h 0m
2026-07-07 N217DK - Jul 7, 16:55 UTCJul 7, 18:20 UTC1h 25m
2026-07-07 N217DK KOA → KOA Jul 7, 01:30 UTCJul 7, 02:00 UTC30m
2026-07-06 N217DK KOA → KOA Jul 6, 21:50 UTCJul 6, 23:15 UTC1h 25m
2026-07-05 N217DK - Jul 5, 17:40 UTCJul 5, 17:55 UTC15m
2026-07-04 N217DK - Jul 4, 05:55 UTCJul 4, 06:40 UTC45m
2026-07-04 N217DK - Jul 4, 04:55 UTCJul 4, 05:05 UTC10m
2026-07-03 N217DK - Jul 3, 20:05 UTCJul 3, 20:20 UTC15m
2026-07-03 N217DK - Jul 3, 18:35 UTCJul 3, 18:45 UTC10m
2026-07-03 N217DK - Jul 3, 17:45 UTCJul 3, 17:55 UTC10m
2026-07-03 N217DK - Jul 3, 04:25 UTCJul 3, 05:10 UTC45m
2026-07-02 N217DK KOA → KOA Jul 2, 19:30 UTCJul 2, 20:10 UTC40m
2026-07-02 N217DK - Jul 2, 06:15 UTCJul 2, 07:00 UTC45m
2026-07-01 N217DK KOA → KOA Jul 1, 23:40 UTCJul 2, 00:20 UTC40m
2026-07-01 N217DK - Jul 1, 21:25 UTCJul 1, 21:35 UTC10m
2026-07-01 N217DK - Jul 1, 17:25 UTCJul 1, 18:55 UTC1h 30m
2026-06-29 N217DK KOA → KOA Jun 29, 19:35 UTCJun 29, 21:05 UTC1h 30m
2026-06-28 N217DK - Jun 28, 23:09 UTCJun 28, 23:20 UTC10m
2026-06-28 N217DK KOA → KOA Jun 28, 21:30 UTCJun 28, 22:04 UTC35m
2026-06-27 N217DK - Jun 27, 17:39 UTCJun 27, 17:49 UTC10m
2026-06-25 N217DK - Jun 25, 23:19 UTCJun 25, 23:59 UTC40m
2026-06-25 N217DK KOA → KOA Jun 25, 17:25 UTCJun 25, 18:04 UTC40m
2026-06-23 N217DK KOA → KOA Jun 23, 23:59 UTCJun 24, 00:34 UTC35m
2026-06-23 N217DK KOA → KOA Jun 23, 21:54 UTCJun 23, 22:25 UTC30m
2026-06-23 N217DK - Jun 23, 19:50 UTCJun 23, 20:04 UTC15m
2026-06-22 N217DK KOA → KOA Jun 22, 23:35 UTCJun 23, 00:15 UTC40m
2026-06-22 N217DK - Jun 22, 21:25 UTCJun 22, 22:24 UTC1h 0m
2026-06-22 N217DK KOA → KOA Jun 22, 19:34 UTCJun 22, 20:04 UTC30m
2026-06-22 N217DK KOA → KOA Jun 22, 17:29 UTCJun 22, 18:19 UTC50m
2026-06-21 N217DK KOA → KOA Jun 21, 21:44 UTCJun 21, 22:44 UTC1h 0m
2026-06-20 N217DK KOA → KOA Jun 20, 19:40 UTCJun 20, 20:29 UTC50m
2026-06-19 N217DK KOA → KOA Jun 19, 19:29 UTCJun 19, 19:59 UTC30m
2026-06-19 N217DK KOA → KOA Jun 19, 17:39 UTCJun 19, 18:20 UTC40m
2026-06-18 N217DK - Jun 18, 19:40 UTCJun 18, 20:05 UTC25m
2026-06-18 N217DK - Jun 18, 18:25 UTCJun 18, 18:35 UTC10m

About Mode-S

A Mode-S transponder code (also called an "ICAO 24-bit address" or "hex code") is a 6-character hexadecimal identifier permanently assigned to an aircraft when it's first registered. Unlike callsigns (which change with each flight) or registrations (which can change if an aircraft is sold internationally), the Mode-S address stays with the airframe for the life of the aircraft in that country.

Every ADS-B transmission from an aircraft includes its Mode-S address, making it the most reliable way to identify a specific airframe. Flight-tracking services like Apparatus use the Mode-S address as the primary key for tying position broadcasts, callsigns, and ownership records together.

Prefer a tail-number view? See the N217DK page for operator, model, and routing details .

Mode-S A1D3D8 frequently asked

What is Mode-S code A1D3D8?
A1D3D8 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N217DK.
Where is Mode-S A1D3D8 registered?
Mode-S code A1D3D8 is allocated to United States (US). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is A1D3D8 broadcasting right now?
No active broadcast right now. Last signal was 5h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A1D3D8, octal 50351730, decimal 10,605,528.
What flights does A1D3D8 operate?
Mode-S A1D3D8 has broadcast 1 distinct callsign, including N217DK.